Version history
---------------
+[2.0.0] - 2020-01-16
+
+* Changed SgNB UE X2AP ID to be an optional IE in SGNB ADDITION REQUEST REJECT
+ to be compatible with 3GPP 36.423 standard. API backward incompatible change.
+
[1.0.0] - 2020-01-14
* Fixed overlapping declaration error hit in Golang data structures, which